remain cautious and ready for a possible emergency
保持警惕以应付可能的突发事件
(of a woman) go to the toilet (used as a euphemism)
(婉)（女人）上卫生间
To be ready for a challenge with little warning.
准备万一：准备接受事先没有什么警告的挑战
To make a quick departure; run away.
迅速离开；逃之夭夭